Linear Motor Magnet Plate Segmentation for Flux Control
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Solution Overview
Problem
In linear motors, widening the magnet plate width reduces flexural rigidity, causing deformation and difficulty in maintaining the armature-magnet plate spacing, which leads to demagnetization of permanent magnets in regions not contributing to thrust due to focused magnetic flux.
Innovation Solution
The design includes a magnet plate with non-thrust regions devoid of permanent magnets and an armature core with specific tooth configurations, such as main and auxiliary teeth, to distribute magnetic flux and prevent demagnetization by avoiding concentration on the magnet ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the width of the magnet plate is widened, then the thrust capacity is improved, but the flexural rigidity is reduced causing deformation
Solution Approach 1:
The magnet plate is divided into multiple separate magnet plates arranged side by side, each with its own support structure. This segmentation allows each plate to maintain adequate flexural rigidity while collectively providing the required thrust capacity through distributed magnetic poles across multiple plates.
Solution Approach 2:
Instead of increasing the width of a single magnet plate (one-dimensional solution), the invention transitions to a multi-plate configuration where multiple narrower plates are arranged in parallel. This dimensional transition maintains the flexural rigidity of individual plates while achieving the required total thrust capacity through the combined effect of multiple plates.
2Stability of the object's composition
If bolts are added to the central part of the magnet plate to suppress deformation, then the structural stability is improved, but the permanent magnet regions are reduced causing demagnetization
Solution Approach 1:
By segmenting the magnet plate into multiple narrower plates, the invention eliminates the need for central bolts that would create non-thrust regions. Each segmented plate can be supported at its ends without requiring central fastening, thus avoiding the creation of demagnetization-prone regions while maintaining structural stability.
Solution Approach 2:
The invention extracts the problematic central bolt configuration from the design. Instead of adding central bolts that create non-thrust regions, the segmented plate structure achieves stability through distributed end-supports, completely removing the source of demagnetization risk.
3Strength
If the magnet plate is fixed with bolts at both ends and center, then the deformation is suppressed, but the magnetic flux focuses on the end of permanent magnets causing demagnetization
Solution Approach 1:
The magnet plate is segmented into multiple narrower plates, each supported only at the ends. This eliminates the central bolt configuration that causes magnetic flux concentration. The segmented structure provides adequate deformation resistance through the distributed support points while avoiding creation of regions where flux focusing would cause demagnetization.
Solution Approach 2:
Each segmented magnet plate is designed with localized magnetic pole arrangements optimized for its specific position. The local magnetic flux distribution is controlled to avoid concentration at bolt locations, as the segmented structure eliminates central bolting and allows each plate segment to have uniform flux distribution across its narrower width.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses demagnetization of permanent magnets in non-thrust regions by redistributing magnetic flux, maintaining the armature's thrust efficiency and extending the lifespan of the magnets.
Implementation Method 1
the magnet plate and the armature are made to relatively move along an arrangement direction of the magnets, by way of thrust produced between the magnet plate and the armature
Implementation Method 2
an armature (for example, the armature 20 described later) having a core (for example, the core 21 described later) serving as a main body and a coil (for example, the coil 22 described later) attached to the core
Data Source
AI summary
A linear motor includes a magnet plate on which magnets of different polarity are alternately arranged along a drive direction, and an armature having a core serving as a main body and a coil attached to the core. The magnet plate and the armature are made to relatively move along an arrangement direction of the magnets, by way of thrust produced between the magnet plate and the armature. The magnet plate has a non-thrust region that extends along an arrangement direction of the magnets, and does not contribute to the thrust. The core of the armature at least includes a plurality of main teeth to which the coil is attached. The main teeth are not provided in a region opposing the non-thrust region of the magnet plate.